Method of and apparatus for crushing coal and the like



July 28, 1925.

' E. BARTHELMESS v METHOD OF AND APPARATUS FOR CRUSHING co L AND THE LIKE Filed Sept. 15, 1924 //7 en/0n Patented July 28, 1925.

13 hr mm. a

IVIETHOD OF AND APPARATUS FOR CRUST-IING COAL AND THE LIKE.

Application filed September 13, 1924. Serial No. 737,572.

To all iii/1.0m it may concern Be it known that I, EMIL BARTHELMESS, acitizen ot the German Republic, residing at Dusseldorf-Uberkassel, Germany, have invented a certain Method of and Apparatus for Crushing Coal and the like, for which I have filed an application in Germany on July 20, 1923, and, in Great Britain on July 21, 1924-, and of which the following is a specification.

It is usual in connection with crushing mills to employ elevators whereby the reduced materials are raised into sieves or other separating devices whence the coarse product is fed back into the mill for renewed treatment.

The object of the present invention is to simplify the mechanism whereby the final product is obtained, and the invention consists essentially in leading the crushed materials from the mill into a conduit, feeding fresh materials into the same conduit, raising the materials together by.

means of an air-blast into a centritugal separator, discharging the fine materials from said separator, and leading the coarse materials from the separator back into the mill.

The apparatus employed for carrying out this operation, consists of closed conduit through which and through concentric separating drums arranged in the conduit in an elevated position, air is circulated by means of a blower.. A crushing-mill is arranged so as to be fed from one of the drums while the final product is discharged from the other drum. The fresh material is introduced into the conduit by means of a feeding device whereby communication between this conduit and the atmosphere is prevented. The degree of reduction is regulated by varying the capacity of ports through which the air-blast passes from one drum into the other.

By this combination of elements a very simple and compact mechanism is obtained which can be operated with greater facility and with less driving power than the machines ordinarily used to produce the same result.

Fig. 1 of the accompanying drawings represents a diagrammatic view of one embodimerit of the invention, and

7 is a longitudinalsection ot a teeding device of modified construction, and

Fig. 8 a section of the feeding drum employed in the latter.

A crushing-mill (Z is arranged so as to discharge the crushed materials into a conduit in which a blower e is arranged. The conduit is carried upwards to a separator composed of two vertical, concentric drums 0 and 2' which receive the materials in succession as they are forced by the blower e up the conduit. The air-blast and the materialssuspended therein, enter at the hottom of one of the drums, the coi'inecting pipe m being arranged tangentially to the drum so that the materials pass with whirling motion'up the drum. The heavy particles are retained by gravity and centrifugal action and fall through the drum into a chute cl which returns them to the mill (Z for further treatment. The finer particles ascend with the air through the drum and pass into the second drum through small apertures 0 made in the up per part of the inner drum. The apertures are protected by shields 7a which are" ar' ranged tangentially to the drum so that the whirling motion of the materials is kept up also in the second drum. Passing down through this drum, the particles are separated from the air and pass into a chute through which thus the final product can be discharged. The air, cleared of suspended particles, is led back through pipes 11 and Z into the blower e.

The degree of reduction can be regulated by varying the effective size of the apertures 0, for which purpose a throttling-hood '2" may be arranged over the upper end of the inner drum so that it can be adjusted rotatively thereon by means of a hand lever 72, which is connected to thehood', the latter being formed with apertures which can be brought more or less into register with the apertures 0. The shields 7a which form the inlets into tangential ports, are preferably connected to the hood r as shown in Fig. 3v

In the arrangement according to Fig. l, the outer drum 0 receives the materials first and separates out the coarse particles. The arrangement may be reversed as shown in Fig. 2 where the air-blast passes from the inner drum into the outer one. In Fig. 1, moreover, the inner drum t is shown to be conical and to form passages which widen out in the travelling direction of the materials. By this widening of the passages and by the consequent reduction in the velocity of the air, the separating action is enhanced.

The fresh materials are fed direct into the conduit 9 and pass together with the crushed materials to the separating drums so that the finer particles will be divided off before the materials enter the crusher. The feeding device is composed of a horizontal cylin-.

der 6 within which a feeding drum 6 is rotatably arranged. Fined vanes 20 in the drum t feed the materials through the latter when the drum is rotated. In the arrange ment shown in Figs. 5 and 6, the cylinder 5 is formed with an inlet 79 at one end and with a diametrically opposite outlet q at the other end. The drum 2% has an inlet it and an outlet '0, both arranged at the same side of the drum so as to coincide with the inand outlet of the cylinder 6 at different times. Thus the conduit wil remain closed to the atmosphere while the materials are fed through from a hopper 64. There may be an inlet at the middle of the cylinder and feeding drum and outlets at both ends, as shown in Figs. 6 and 7. The chute f is arranged so that the materials can be fed from the same back into the hopper a, if repeated grinding of the materials should be required.

The drum i may be rotated in any convenient manner. Fig. 6 shows a driving gear composed of a shaft on which a friction wheel 3 is slidably feathered, and a friction disc 3 to which the wheel 1 imparts rotation at different speeds, in known manner, the movement of the disc 1 being communicated to the drum 2? through the medium of a worm near an. Alternative methods are shown in Figs. 7 and 8, stepped belt-pulleys 8 being used in one case and toothed gears z in the other.

I claim:

1. The combination with a crushing mill, of a hopper arranged on a level with said mill, a conduit passing under the mill and hopper and connected to both so as to receive materials therefrom, 'a separator arranged above the mill and connected to one end of said conduit, a blower connected to the other end of the conduit for forcing the materials from the hopper and the mill to the separator, a conduit connecting the separator with the blower, means for discharging the liner materials from the separator and means for leading the coarse materials from the separator back to the mill.

2. The combination with a crushing mill of two vertical, concentric drums arranged above the mill and communicating with one another at the top through tangentially arranged ports, means for regulating the capacity of said ports, a hopper arranged on a level with the mill, a conduit arranged under the mill and the hopper and connected to both so as to receive materials therefrom, one end of said conduit opening tangentially into the lower part of one of said drums, a blower connected to the other end of the conduit for forcing the materials through the drums in succession, a conduit connecting the drums with the blower, means for discharging the materials trapped in the second drum, and means for leading the materials from the first drum back to the mill.

3. The combination with a crushing mill of two vertical, concentric drums arranged above the mill and communicating with one another at the top through tangentially arranged ports. means for regulating the capacity of said ports, a hopper arranged on a level with the mill, a conduit arranged under the mill and the hopper and connected to both so as to receive mate-rials therefrom, one end of said conduit opening tangentially into the lower part of one of said drums, a blower connected to the other end of the conduit for forcing the materials through the drums in succession, the drums being shaped so as to form passages which widen out in the travelling direction of the materials, a conduit connecting the drums with the blower, means for discharging the materials trapped in the second drum, and means for leading the materials from the first drum back to the mill.

4. The combination with a crushing mill, of a hopper arranged on a level with said mill, a conduit passing under the mill and hopper and connected to, both'so as to receive materials therefrom. a feeding device adapted to convey materials from the hopper to the conduit without establishing communication between .the latter and the atmosphere, a separator arranged above the mill and connected to one end of said conduit. a blower connected to the other end of the conduit for forcing the materials from the hopper and the mill to the separator, a conduit connecting the separator with the blower, means for discharging the finer materials from the separator, and means for leading the coarse materials from the separator back to the mill.

BARTHELMESS. 

